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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4fc23989c6e3b78878fc9de5ea2d7339c8bc98ec64c316a9dae383e07885de' 
  AND token = 'foWqmFkfaXRWVv7E6krg8LGYjOwbUiOVWEwww52KL2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}